Which of these identifies a difference in the braking system of a combination truck with doubles/triples from the braking system of a combination truck with only one trailer?
Double/triple trailers have more parts that control the brakes on doubles and triples.
Double/triple trailers have two air lines—an emergency line and service line.
Doubles and triples do not have spring brakes.
Some doubles have spring brakes but no triples have spring brakes.
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